from typing import List

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class RecursiveItem(BaseModel):
    sub_items: List["RecursiveItem"] = []
    name: str


RecursiveItem.update_forward_refs()


class RecursiveSubitemInSubmodel(BaseModel):
    sub_items2: List["RecursiveItemViaSubmodel"] = []
    name: str


class RecursiveItemViaSubmodel(BaseModel):

✋️ 🐍 ✔️ 🎯 🌌 📣 📇 ⏮️ 🔗 🆎, ⚖️ "🆎 🔢":

### 🗄 ⌨ `List`

🐍 3️⃣.9️⃣ & 🔛 👆 💪 ⚙️ 🐩 `list` 📣 👫 🆎 ✍ 👥 🔜 👀 🔛. 👶

✋️ 🐍 ⏬ ⏭ 3️⃣.9️⃣ (3️⃣.6️⃣ & 🔛), 👆 🥇 💪 🗄 `List` ⚪️➡️ 🐩 🐍 `typing` 🕹:

```Python hl_lines="1"
{!> ../../docs_src/body_nested_models/tutorial002.py!}
```

### 📣 `list` ⏮️ 🆎 🔢

📣 🆎 👈 ✔️ 🆎 🔢 (🔗 🆎), 💖 `list`, `dict`, `tuple`:

     */
    @Nonnull
    MessageBuilderFactory messageBuilderFactory();

    /**
     * Returns the command-line arguments to be parsed.
     *
     * @return a list of argument strings
     */
    @Nonnull
    List<String> args();

    /**
     * Per-request {@link Lookup} for customization.
     *
     * @return a lookup possibly with custom components
     */
    @Nonnull

my_list: list[str]
```

Und in Python-Versionen vor 3.9:

```Python
from typing import List

my_list: List[str]
```

Das ist alles Standard-Python-Syntax für Typdeklarationen.

Verwenden Sie dieselbe Standardsyntax für Modellattribute mit inneren Typen.

In unserem Beispiel können wir also bewirken, dass `tags` spezifisch eine „Liste von Strings“ ist:

//// tab | Python 3.10+

```Python hl_lines="12"

    private static final long serialVersionUID = 1L;

    private final List<Pair<String, String>> searchFieldLogList = new ArrayList<>();

    private final List<Pair<String, String>> headerList = new ArrayList<>();

    private OptionalEntity<UserInfo> userInfo;

    private Map<String, Object> fields;

    private final List<Map<String, Object>> documentList = new ArrayList<>();

    @Override

    resolve_files(items=config.extra_javascript, files=files, config=config)
    return files


def generate_renamed_section_items(
    items: List[Union[Page, Section, Link]], *, config: MkDocsConfig
) -> List[Union[Page, Section, Link]]:
    new_items: List[Union[Page, Section, Link]] = []
    for item in items:
        if isinstance(item, Section):
            new_title = item.title

                // } else if ("list".equals(qName)) {
                // nothing
            } else if ("item".equals(qName) && fieldName != null) {
                final Object obj = dataMap.get(fieldName);
                if (obj instanceof List) {
                    @SuppressWarnings("unchecked")
                    final List<String> list = (List<String>) obj;
                    list.add(buffer.toString());
                }

   * ordering, this method returns a {@link List}, instead of the {@link Collection} specified in
   * the {@link ListMultimap} interface.
   */
  @Override
  public List<V> values() {
    return (List<V>) super.values();
  }

  @Override
  List<V> createValues() {
    @WeakOuter
    class ValuesImpl extends AbstractSequentialList<V> {
      @Override

  @CollectionSize.Require(absent = ZERO)
  public void testPutDuplicateValue() {
    List<Entry<K, V>> entries = copyToList(multimap().entries());

    for (Entry<K, V> entry : entries) {
      resetContainer();

      K k = entry.getKey();
      V v = entry.getValue();

      List<V> values = multimap().get(k);
      List<V> expectedValues = copyToList(values);

      assertTrue(multimap().put(k, v));

    private final PathTranslator pathTranslator;
    private final List<String> expressionPrefixes;

    public PathTranslatingPostProcessor(
            List<String> expressionPrefixes,
            List<String> unprefixedPathKeys,
            File projectDir,
            PathTranslator pathTranslator) {
        this.expressionPrefixes = expressionPrefixes;
        this.unprefixedPathKeys = unprefixedPathKeys;
        this.projectDir = projectDir;